Advent calendar 2013

There's nothing simpler than 1,2,3, ...

Thank goodness for the number 10!

We're keeping a watchful eye on the Christmas pounds behind door number 9...

How do I love infinity? Let me count the ways....

Seven is a lucky number. No, seriously, it is!

What's your chance of winning the lottery?

Triangles do it, squares do it, even hexagons do it — but pentagons don't. They just won't fit together to tile your bathroom wall.

How to colour a map

Make a fractal in infinitely many simple steps!

When Archilles and the tortoise race, who will come second? Find out behind door number two!

How can the number one help spot fraud in tax returns, elections, or mistakes in data sets? Find out behind door number 1!

It's nearly time for the Plus Advent Calendar!